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Reversible and Irreversible Time-Dependent Behavior of GRCop-84A series of mechanical tests were conducted on a high-conductivity copper alloy, GRCop-84, in order to understand the time dependent response of this material. Tensile, creep, and stress relaxation tests were performed over a wide range of temperatures, strain rates, and stress levels to excite various amounts of time-dependent behavior. At low applied stresses the deformation behavior was found to be fully reversible. Above a certain stress, termed the viscoelastic threshold, irreversible deformation was observed. At these higher stresses the deformation was observed to be viscoplastic. Both reversible and irreversible regions contained time dependent deformation. These experimental data are documented to enable characterization of constitutive models to aid in design of high temperature components.
Document ID
20170004516
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Lerch, Bradley A.
(NASA Glenn Research Center Cleveland, OH United States)
Arnold, Steven M.
(NASA Glenn Research Center Cleveland, OH United States)
Ellis, David L.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
May 10, 2017
Publication Date
April 1, 2017
Subject Category
Structural Mechanics
Metals And Metallic Materials
Report/Patent Number
GRC-E-DAA-TN31653
NASA/TM-2017-219119
E-19243
Funding Number(s)
WBS: WBS 228556.04.03.10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
viscoelasticity
stress relaxation
mechanical properties
viscoplasticity
copper
Poisson ratio
plastic deformation
creep
constitutive equations
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